Huawei MU739 Hardware Manual page 43

HUAWEI MU739 HSPA+ LGA Module
Hardware Guide
S11 or VSWR
S11 (return loss) indicates the degree to which the input impedance of an antenna
matches the reference impedance (50-ohm). S11 shows the resonance feature and
impedance bandwidth of an antenna. Voltage standing wave ratio (VSWR) is another
expression of S11. S11 relates to the antenna efficiency. S11 can be measured with a
vector analyzer.
The following S11 values are recommended for the antenna of MU739: S11 of the
master antenna < – 6 dB
Polarization
The polarization of an antenna is the orientation of the electric field vector that rotates
with time in the direction of maximum radiation.
The linear polarization is recommended for the antenna of MU739.
Radiation Pattern
The radiation pattern of an antenna reflects the radiation features of the antenna in
the remote field region. The radiation pattern of an antenna commonly describes the
power or field strength of the radiated electromagnetic waves in various directions
from the antenna. The power or field strength varies with the angular coordinates (θ
and φ), but is independent of the radial coordinates.
The radiation pattern of half wave dipole antennas is omnidirectional in the horizontal
plane, and the incident waves of base stations are often in the horizontal plane. For
this reason, the receiving performance is optimal.
The following radiation patterns are recommended for the antenna of MU739. Master
antenna: omnidirectional
Gain and Directivity
The radiation pattern of an antenna represents the field strength of the radiated
electromagnetic waves in all directions, but not the power density that the antenna
radiates in the specific direction. The directivity of an antenna, however, measures the
power density that the antenna radiates.
Gain, as another important parameter of antennas, correlates closely to the directivity.
The gain of an antenna takes both the directivity and the efficiency of the antenna into
account. The appropriate antenna gain prolongs the service life of relevant batteries.
The following antenna gain is recommended for MU739. Gain of the master antenna
≤ 2.5 dBi
Issue 01 (2011-08-24)
The antenna consists of the antenna body and the relevant RF transmission cable. Take the

RF transmission cable into account when measuring any of the preceding antenna
indicators.
Huawei cooperates with various famous antenna suppliers who are able to make

suggestions on antenna design, for example, Amphenol, Skycross, Pulse, etc.
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RF Specifications
43